Extension arm attachment for jacks



March 4, 1941. B. J. KELLEY EXTENSION ARM ATTACHMENT FOR JACKS Filed April 9', 1940 ATTORNEYS Patented Mar. 4, 1941 UNITED S ATES PATENT OFFICE EXTENSION ABM ATTACHMENT m JACKS Barton J. Kelley, Punxautawney, Pa. Application April 9, 1940, Serial No. 328,747

- 4 own-Q (01. 254-134) This invention relates to improvements for attachments for Jacks and particularly to 'an extension lifting arm for the same:

It is an object of this invention to'provide a novel lifting arm extension useful iii-conjunction with existing types of jacks which may with facility be attached to or disconnected from the jack without requiring the use of special toolsor the like.

Another object of this invention is to a lateral extension arm assembly attachable-to existing types of jacks whereby when the Jack is used to raise an automobile or the like the head of the jack plunger can be ens sed with a portion of the chassis and the extension'arm engaged with a part of the axle whereby both axle and chassis can be simultaneously lifted.

Another object of this invention is to provide a mechanical assembly attachable to each of,

the several existing types of jacks which will include a vertically attachably swingable lifting arm permitting the intended use of the Jack with any type of vehicle irrespective of therelatlve.

position of parts of the chassis against which the lifting head of the jack is used and the axle under parts.

As must follow from what has been an important advantage of the novel jack extension lifting arm according to this invention is that it permits simultaneous lifting of a vehicle chassis and axle with the result'that it is not now necessary as heretofore to raise the vehicle chassis until the vehicle spring has pas'seddts maximum downward extension and the vehicle.

Noteworthy among the features of the novel jack according to the present invention are its simplicity and ruggedness of construction-, the

former suiting the device to the requirements or manufacture under conditions of mass produc tion and thelatter assuring long useful life. Other objects, advantages and features of the new and improved jack according to the present invention will be apparent to those skilled inof the 'following,de-'s this art during the course scription'.

Regarded in certain of present invention comprises in combination with a jack of the type having a vertically recip-. rocable plunger, the improvements which com prise an outwardly extending swinging'arm connected to and movable with said plunger for supporting at other points obiectsrestingupon said plunger.

' In order to facilitate a fuller and moi-scorn said above; I

its brewer es-pea t e,

plete understanding of the present invention a specific embodiment thereof herein illustrated will be hereinafter described, it being clearly understood, however, that the illustrated embodiment, although presently preferred, is provided-solely by way of example of the practice .of, this invention and not'b'y way of limitation thereof- -'except insofar as the invention is rein? the "subjoined "claims. provide Referring then to the drawing, Figure" l) is substantially a side elevatlonal view; of the p esently preferred embodiment of fthis'invention' illustrating use of the same in the liftingof a conventional automotive vehicle,

Fig; 2 .isessentially an enlarged side elevatlon a'l' view of the device shownin Fig. 1 showing detailsof the structure thereof,

clusive of the drawing wherein the presently preferredembodiment of this invention is illustrated, it will be notedthat the device generally designated by the reference character l0 comprises a bar-like member If substantially T- shap d in cross sectional outline and receivable within a vertically extending .T-shaped slot formed in a side of the jack generally designated by the reference character A. A horizontally extending top piece I! integrally formed with the member is downturned'on its extreme end I! to facilitate engagement with the head B of 'th'e'z'jack whereby the member and the jack plunger can be moved simultaneously. An outprojecting bracket i4 mounted ,on the member ii near the base of the jack is provided with-openings to receive a pivot i5 carrying an extension armgenerally designated by the reference character It whereby'free swinging motion of the within a vertical plane is permitted.

arm it is longitudinally adjustablyextensibl'e jandcomprisesan arm proper ll which is connected-at one end to the bracket it above described and which carries a longitudinally.

extending rib or otngue. Ila receivable in a groove formed in an extension II which is coupled to the arm i I by means including a band I! circumjacent parts'of said am and said extension, essentially as shown.

A pin 20 removably mounted in the band I! is engageable with openings Ila in the extension is, thus facilitating the holding of the extension with respect to the arm in a selected adjustment. The distal free end of the extension arm i6 is upturned to provide a hook element lab for engaging with parts of the object to be lifted as will hereinafter be described.

A chain 2| connected to an eye 22 attached to the band I can be engaged with a hook 23 mounted upon the member ii near the top thereof whereby the extension arm can be held at a selected angularity with respect to the essentially upright member Ii as will be apparent from an inspection of the drawing.

In the embodiment of the invention illustrated in 'Fig. 6 a lifting extension arm generally designated by the reference character 30 is shown mounted upon a Jack generally designated by the reference character D. A hook 3| attached to the Jack plunger E near the top thereof corresponds to the hook 23 in the first described embodiment of this invention and engages with a chain 32 connected to a collar 33 upon a longitudinally extensible arm 34 swingably mounted in a bracket 35 attached to a side part of the jack. The arm includes an integrally formed hook element 34a which is engageable with parts of the object to be lifted as will be hereinafter described.

" A third embodiment of this invention is illustrated in Fig. '1 wherein a lack F is shown equipped with an adjustable lifting arm extension generally designated by the reference character 40 comprising a downwardly extending member Ii integrally formed with a portion of the jack shoe 42 carried on the jack plunger 43. A bracket 44 mounted on the member ll serves swingably .to hold a longitudinally adjustable extension arm generally designated by the referencecharacter 4-5 and comprising interconnected elements 46 and 41 similar to the swinging arm I1 and extension ll described in connection with the first illustrated embodiment of this invention. A lifting arm is held in a selected angularity with respect to the member 4| by means of a chain 48 attached to a band 48 mounted on the arm and to a hook 50 mounted upon the member near the top thereof. A hook formation 45a is provided upon the end of the extension arm to facilitate gripping of parts of the object to be lifted as subsequently will be described. A guide bolt 5| mounted in a bottom portion of the member ll projects into a vertically extending slot formed in the side of the jack, thereby assuring smooth vertical movement of the member during use.

, Each of the described embodiments of this invention is used in substantially the same manner and, accordingly, a description of the mode of use of the embodiment illustrated in Figs. 1 to 5 inclusive will sufflce for and be applicable to each of the embodiments of this invention.

Assuming it is desirable to lift a portion of the vehicle, as for instance it is necessary in replacing a wheel or a tire, the shoe portion B of the jack A is positioned beneath a part of the vehicle chassis, such for instance as the bumper x in Fig. l, and the hook element |8b of the extension arm 16 is positioned beneath a part of the vehicle axle Y, appropriate adjustment of the chain 2| upon the hook 28 being made to assure simultaneous lifting of the axle and the bumper. The Jack is then operated to cause the plunger thereof to rise and, as will be apparent from what has been said above, the member ii will be carried with the plunger, thereby also carrying the extension arm Ii engaging with the vehicle axle. In this manner the axle is moved simultaneously with the bumper and sag in of the vehicle spring Z is precluded.

It is to be understood that thi invention is capable of extended application andis not confined to the precise illustrated forms nor described construction and, therefore, such changes and modifications may be made therein as do not aflect the spirit of the invention nor exceed the scope of the appended claims.

Having thus. described the present invention, what it is desired to secure in Letters Patent is:

1. In combination with a jack of the type including a vertically movable support, the improvement which comprises a vertically extending member mounted on and movable with said support; an arm, swingable in a vertical plane, mounted on said member near the base of the jack; a hook element on the free distal end of said arm; and a coupling of adjustable length connecting the top end of said member with said arm.

2. In combination with a jack of the type having a vertically reciprocable plunger, the improvements which comprise a downwardly extending member connected at its top to the top end of said plunger; a bracket mounted on said member near the bottom thereof; an arm swingably mounted in said bracket, means for longitudinally extending said arm comprising a barlike element grooved to be slidably received upon the distal part of said arm, and means for rigidly connecting said arm and said element together; an upturned hook element on the end of said arm distal with respect to the bracket; and means for holding said arm in a selected angular relationship with respect to said member comprising a collar mounted on said arm between the bracket and the hook element, a hook on said member near the top thereof, and a chain connected at one end to said collar engageable with said hook.

3. In combination with a jack of the type including a vertically movable support, the improvement which comprises a vertically extending member mounted on and movable with said support; ,a longitudinally adjustably extensible arm, swingable in a vertical plane, mounted on said member near the base of the lack; an upturned hook element formed onthe free distal end of said arm; and a coupling of adjustable length connecting the top end of said member with said arm at a place near the midpoint thereof.

4. In combination with a jack of the type having a vertically reciprocable plunger, the imand means for rigidly-connecting said arm and said element together; an upwardly opening hook element on the end of said arm distal with respect to the bracket; and means for holding said arm in a selected angular relationship with respect to said member comprising a collar mounted on said am between the bracket and the hook element, a hook on said member near the top thereof, and a chain connected at one end to said collar engageable with said hook.

BURTON J. KELLEY.

Gil 

